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首页> 中文期刊> 《生态环境学报》 >稻草覆盖对旱地土壤CO2排放的影响

稻草覆盖对旱地土壤CO2排放的影响

         
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摘要

在中国南方丘陵地区,稻田与旱地交错相接,将稻草移施旱地不仅可以减缓稻田甲烷排放,而且可以提高旱地土壤肥力,但对旱地土壤CO2排放的影响尚缺乏了解.选取油菜(Brassica campestrisL.)-玉米(Zea maysL.)轮作土壤为研究对象,每季作物分别覆盖5 000 kg·hm-2稻草(SM),以不覆盖稻草为对照(CK),采用静态箱-气相色谱法监测油菜-玉米轮作周期内的土壤CO2排放动态,同时监测了5 cm深度土壤温度和含水量.结果表明,(1)稻草覆盖在低温季节提高土壤温度,在高温季节降低土壤温度;同时,稻草覆盖有助于保持土壤水分,可以缓解一定程度的干旱.(2)土壤CO2通量具有明显的季节性,与土壤温度呈极显著正相关(r=0.736,P=0.000).(3)稻草覆盖显著促进土壤CO2排放.油菜季稻草覆盖处理和对照处理的CO2通量平均值分别为34.0 mg·m-2·h-1和21.2 mg.m-2·h-1,CO2累积排放量分别为3 723 kg·hm-2和5 981 kg·hm-2.玉米季稻草覆盖处理和对照处理的CO2通量平均值分别为279.9 mg·m-2·h-1和221.6 mg·m-2·h-1,CO2累计排放量分别为7 591kg.hm-2和6 009 kg·hm-2.全年(包括无作物生长期间)稻草覆盖和对照处理的CO2累计排放量分别达到15 131 kg·hm-2和11 220kg.hm-2,稻草覆盖增加了34％的CO2排放.%Paddy and upland are adjacent in hilly area in southern China.Returning rice straw into upland could not only mitigate methane emissions from paddy soil,but also improve upland soil fertility.However,the effects of rice straw mulching on CO2 emission in upland soils have not been well documented yet.This study was accomplished in rape (Brassica campestris L.)-maize (Zea mays L.) cropping upland with two treatments,including rice straw mulching (SM,each crop season received 5 000 kg·hm-2 straw) and control (CK).CO2 fluxes were measured using static chamber-gas chromatography method throughout the rape-maize rotation period.Soil temperature and moisture at a depth of 5 cm were measured simultaneously.The results showed that:(1) SM increased soil temperature in low temperature season and decreased soil temperature in high temperature season.At the same time,SM was conducive to holding soil water content,which could alleviate drought to a certain extent.(2) Soil CO2 fluxes showed seasonal variation,and were positively correlated with soil temperature (r=0.736,P＜0.000).(3) SM significantly increased CO2 emissions.The average CO2 fluxes during rape season were 34.0 mg·m-2·h-1 and 21.2 mg·m-2·h-1 for SM and CK plots,and the corresponding cumulative CO2 fluxes were 5 981 kg·hm-2 and 3 723 kg·hm-2,respectively.The average CO2 fluxes during maize season were 279.9 mg·m-2·h-1 and 221.6 mg·m-2·h-1 for SM and CK plots,and the corresponding cumulative CO2 fluxes were 7 591 kg·hm-2 and 6 009 kg·hm-2,respectively.The total cumulative CO2 fluxes were 15 131 kg·hm-2 and 11 220 kg·hm-2 for SM and CK,respectively,throughout rape-maize rotation including non-crop period.SM increased 34％ of CO2 fluxes.

著录项

  • 来源
    《生态环境学报》 |2016年第11期|1842-1847|共6页
  • 作者

    王云秋; 吴小红; 王卫; 侯海军; 陈安磊; 谢小立;

  • 作者单位

    中国科学院亚热带农业生态研究所//亚热带农业生态过程重点实验室,湖南长沙410125;

    中国科学院大学,北京100049;

    中南林业科技大学生命科学与技术学院,湖南长沙410004;

    中国科学院亚热带农业生态研究所//亚热带农业生态过程重点实验室,湖南长沙410125;

    中国科学院亚热带农业生态研究所//亚热带农业生态过程重点实验室,湖南长沙410125;

    中国科学院亚热带农业生态研究所//亚热带农业生态过程重点实验室,湖南长沙410125;

    中国科学院亚热带农业生态研究所//亚热带农业生态过程重点实验室,湖南长沙410125;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 农业生态学;环境地理学;
  • 关键词

    秸秆还田; 温室气体; 静态箱-气相色谱法; 油菜; 玉米;

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